Re: [R] Selecting elements from all items in a list

2012-02-14 Thread geotheory
Yes the lapply function sorted it out. Thanks for the advice. -- View this message in context: http://r.789695.n4.nabble.com/Selecting-elements-from-all-items-in-a-list-tp4387045p4387505.html Sent from the R help mailing list archive at Nabble.com. __

Re: [R] Selecting elements from all items in a list

2012-02-14 Thread David Winsemius
On Feb 14, 2012, at 8:44 AM, geotheory wrote: Basic question (if you know the answer)... I am dealing with a list of commonly-formatted sub-lists, for example: l <- list("") l[[1]] <- c("A1","A2","A3") l[[2]] <- c("B1","B2","B3") l[[3]] <- c("C1","B2","B3") Lets say I need to extract every

Re: [R] Selecting elements from all items in a list

2012-02-14 Thread Dimitris Rizopoulos
How about: l <- list("") l[[1]] <- c("A1","A2","A3") l[[2]] <- c("B1","B2","B3") l[[3]] <- c("C1","B2","B3") lapply(l, "[[", 2) or sapply(l, "[[", 2) I hope it helps. Best, Dimitris On 2/14/2012 2:44 PM, geotheory wrote: Basic question (if you know the answer)... I am dealing with a li

[R] Selecting elements from all items in a list

2012-02-14 Thread geotheory
Basic question (if you know the answer)... I am dealing with a list of commonly-formatted sub-lists, for example: l <- list("") l[[1]] <- c("A1","A2","A3") l[[2]] <- c("B1","B2","B3") l[[3]] <- c("C1","B2","B3") Lets say I need to extract every 2nd item (i.e. A2, B2, C2). [[]] cannot be used.